In my thread it was suggested that maybe I'd been far enough away from the first that he was unloaded when the second spawned, though I'd have thought that in that case the second would have spawned near where I was and not back at my base?
Maybe it's just a glitch, I don't think you have to worry about getting more and more or getting 2 traders every time.
Remember that the wiki is updated by players and therefore isn't 100% accurate, and often won't have any information about potential bugs like this. Checking the bug tracker there is an open bug for this occurring in Minecraft Bedrock Edition (https://bugs.mojang.com/browse/MCPE-47698), but I didn't see any bugs for it happening in Java Edition. However there is a chance nobody has reported it yet.
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I've had two in existence twice, I chalked the first up to chunk unloading - I'd been running between my base and worksite. The second was more interesting, there were definitely two in closeish proximity near my worksite - I don't think they were far enough away to get unloaded as I moved around but I suppose it's possible.